Akash Deep gets the length ball to angle away as Khawaja is beaten in his attempt to defend before he leans forward to defend the next.
He leaves the length ball pitched wide of the stumps and blocks the next to make it three maidens in a row.
Bumrah continues to build up the pressure with another maiden over to Labuschagne.
Khawaja breaks the shackles as he pulls the short ball from Akash Deep for a boundary, the first runs for Australia in the second session after 24 dot balls in a row.
The next ball holds its line to beat Khawaja on the outside edge and plays and misses off the third ball.
Khawaja is beaten for the third ball in a row before he carefully keeps out the rest of the over.